15
INM 7700 Rev 12
Table 6:
Single channel
Table 7:
Dual-channel ac barriers
Table 9:
Dual-channel star-connected ac barriers
Table 8:
2/3 channel low voltage ac barriers
Note:
Vf
d
is the voltage dropped by a forward biased rectifier diode - 0.6V typically
BARRIER DATA
MULTIMETER TESTS
CONSTANT-CURRENT TESTS
Model
No .
Safety
Description
End-to-end
Resistance
Ω
Diode
Test
+ve
Diode
Test
-ve
Terminal
Voltage
@ 10µA
Terminal
Voltage
@ 20mA
V
Ω
mA
Min
Max
Min
Max
Min
Max
7760ac
10
50
200
62
75
∞
∞
6
9.5
6.9
9.8
7765ac
15
100
150
112
124
∞
∞
12
14.1
12.7
14.4
7778ac
28
600
47
614
651
∞
∞
24.0
24.4
25.4
26.0
BARRIER DATA
MULTIMETER TESTS
CONSTANT-CURRENT TESTS
Model
No .
Safety
Description
End-to-end
Resistance
Ω
Diode
Test
+ve
Diode
Test
-ve
Terminal
Voltage
@ 10µA
Terminal
Voltage
@ 20mA
V
Ω
mA
Min
Max
Min
Max
Min
Max
7755ac
3
10
300
15
19
Vf
d
x 3
Vf
d
x 3
1
2.1
1.8
2.4
7756ac
3
10
300
15
19
Vf
d
x 2
Vf
d
x 2
0.7
1.4
1.2
1.6
BARRIER DATA
MULTIMETER TESTS
CONSTANT-CURRENT TESTS
Model
No .
Safety
Description
End-to-end
Resistance
Ω
Diode
Test
+ve
Diode
Test
-ve
Terminal
Voltage
@ 10µA
Terminal
Voltage
@ 20mA
V
Ω
mA
Min
Max
Min
Max
Min
Max
7761ac
9
90
100
98
107
∞
∞
6
8.6
6.9
8.9
7761Pac
9
350
26
361
378
∞
∞
6.8
8.6
7.7
8.9
7764ac
12
1k
12
1010
1050
∞
∞
10
11.6
10.8
11.9
7766ac
12
150
80
159
174
∞
∞
10
11.6
10.8
11.9
7766Pac
12
75
157
84
92
∞
∞
9.6
10.9
10.4
11.2
BARRIER DATA
MULTIMETER TESTS
CONSTANT-CURRENT TESTS
Model
No .
Safety
Description
End-to-end
Resistance
Ω
Diode
Test
+ve
Diode
Test
-ve
Terminal
Voltage
@ 10µA
Terminal
Voltage
@ 20mA
V
Ω
mA
Min
Max
Min
Max
Min
Max
7728ac
28
300
93
311
333
∞
∞
25
26.7
25.6
8.9